“…Professional judgement must and should be used on occasion, and is (Grace & Mertheimer, 1975;Troutman 1975;Ginn & Imoto, 1976), often without recourse to the literature (Bell et al, 1973). Professional judgement must and should be used on occasion, and is (Grace & Mertheimer, 1975;Troutman 1975;Ginn & Imoto, 1976), often without recourse to the literature (Bell et al, 1973).…”